Novel pyrrolo-oxazines and pyrrolo-oxazoles



United States Patent 3,334,095 NOVEL PYRROLO-OXAZINES AND PYRROLO-OXAZOLES William J. Houlihan, Mountain Lakes, N.J., assignor to Sandoz Inc., Hanover, NJ. No Drawing. Filed Feb. 16, 1965, Ser. No. 433,181 17 Claims. (Cl. 260-244) ABSTRACT OF THE DISCLOSURE Compounds useful as sedatives belonging to the class having one of the basic structural formulas n being an integer of from 2 to 4, inclusive.

The instant invention is directed to three distinct genera of the following formulae:

Each genus has three subgenera dependent upon the value The following definitions are employed throughout the text:

R is either lower straight chain alkyl, e.g., methyl, ethyl, propyland butyl; aryl, e.g., phenyl; ar(lower)alkyl, e.g., benzyl and phenethyl; or cycloalkyl having fiom to 7 carbon atoms, e.g., cycopentyl, cyclohexyl and cycloheptyl;

aryl and the arof ar(lower)alkyl are of the formula Iuz 113 III each of R R R R R R R and R is either a hydrogen atom (H) or one of the following functional groups: lower straight chain alkyl, e.g., methyl, ethyl, propyl and butyl; aryl, e.g., parachlorophenyl; ar(lower) alkyl, e.g., 3,5-dimethylbenzyl; cycloalkyl having from 5 to 7 carbon atoms, e.g., cyclopentyl, cyclohexyl and cycloheptyl; and, together with its counterpart on the same ring carbon atom, polymethylene having from 4 to 6 carbon atoms, e.g., tetramethylene, pentamethylene and hexamethylene; with the proviso that (a) there are no more than three of said functional groups on two adjacent carbon atoms, (b) a plurality of cycloalkyl groups are not bound to adjacent carbon atoms, (c) a plurality of polymethylene groups are not bound to adjacent carbon atoms, and (d) there are a maximum of four of said functional groups on compounds Ib and 10;

each of R R R R and R is either a hydrogen atom (H); a chlorine atom (Cl); a fluorine atom (F); a bromine atom (Br); lower alkyl, preferably having from 1 to 4 carbon atoms, e.g., methyl, ethyl, propyl, isopropyl and butyl; lower alkoxy, preferably having from 1 to 4 carbon atoms, e.g., methoxy, ethoxy, propoXy, isopropoxy and butoxy; trifluoromethyl (--CF lower alkylthio, preferably having from 1 to 4 carbon atoms, e.g., methylthio, ethylthio, propylthio, isopropylthio and butylthio; or, together with its counterpart on an adjacent ring carbon atom, methylenedioxy (OC H O-); with the proviso that (a) at least one of R R R R and R is a hydrogen atom in each aryl and in each ar(lower) alkyl group, (b) a plurality of trifiuoromethyl groups are not bound to adjacent carbon atoms, (c) each R and R of aryl and aralkyl groups is a hydrogen atom in a plurality of such groups bound to the same ring carbon atom, (d) each of R of aryl and aralkyl groups is a hydrogen atom in a plurality of such groups bound to adjacent ring carbon atoms; and (e) each of R and R of aryl and aralkyl groups bound to the same ring carbon atoms as a cycloalkyl group is a hydrogen atom;

n is one of the integers 2, 3 and 4; A is the azacycloalkanone ring of compounds I; and B is the diheterocyclic ring of compound I.

There are several methods of preparing compounds I.

The reaction schemes for two of these methods are presented for the instance when each of R to R is a hydrogen atom. However, having any of the contemplated functional groups in embodied positions does not alter said methods.

R OH e; :04am)...-

1 heat O=C(OHz)m-CR HzN-(CHah-OH 7-? A B +Ha0 I101 solvent IV V VI inert 63 solvent] hHeat X 0 O O OH I ll DMF II II O=C(CH2)mCR V -E C(CHz)mCR O=C'(CH2)m CR 2 days HN' (OHI)n OH N(CHZ)B 'OH VII a b VIII tautomeric mixture V/ O O O 0 g inert II I] ll IV Cl- -OR' R-C(CH2)m-COCOR' solxent wherein The classes of compounds within the scope of this inven- R is lower alkyl (preferably having from 1 to 5 carbon atoms, e.g., methyl, ethyl, propyl, isopropyl, butyl and amyl;

m is one of the integers 2, 3 and 4; and

X is either a chlorine atom (Cl) or a bromine atom The tautomeric mixture VIII is separated into its chemical individuals by known procedures, but such separation is not required to prepare compound VI, which is a particular subgroup of compounds I.

The reaction of IV with an alkyl chloroformate (alkyl chlorocarbonate) IX is efiected in an inert solvent, e.g., toluene and diethylether, at a temperature from to 100 C., preferably Within the range of from -10 to C. Stirring may be employed, but is not required.

For the noted reaction schemes only a catalytic amount of hydrogen ions is needed, as indicated. This is provided by a catalytic quantity of, e.g., paratoluenesolfonic acid. The inert solvent is any solvent, e.g., Xylene, which is inert to both the reactants and the reaction products under the employed conditions. The heat that is indicated may vary, but reflux conditions are preferred.

tion are:

Ia 12,3,5,6,7,7a-hexahydro-pyrrolo 2. 1-b] oxazol-S -ones;

Ia23,4,6,7,8,8a-hexahydro-2H-pyrrolo [2,1-b] [1,3]

oxazin-6-ones;

Ia32,3,4,5,7,8,9,9a-octahydro-pyrrolo [2,1-b] [1,3]

oxazepin-7-ones;

Ib12,3,6,7,8,8a-hexahydro-5H-oxazolo[3,2-a]pyridin- 5-ones;

Ib2,+-2,3,7,8,9,9a-hexahydro-4H,6H,pyrido[2,1-b] [1,3]

oxazin-6-ones;

Ib32,3,4,5,8,9,10,10a-octahydro-7H-pyrido[2,1-b] [1,3]

oxazepin-7-ones;

Isl-2,3,5,6,7,8,9,9a-octahydro-oxazo1o[3,2-a1azepin- S-ones;

Ic22,3 ,6,7, 8,9,10,10a-octahydro-4H-oxazino[3,2-a]

azepin-6-ones;

Ic32,3,4,5,7,8,9,10,11,1la-decahydro-azepin[2,1-b]

[1,3 oxazepin-7-ones.

Genus Ia is exemplified in Table A; genus Ib, in Table B; and genus Ic, in Table C. The subgenera are exemplified in each table. The combinations of genus and subgenus comprise the above-noted classes.

Exemplary compounds within the scope of these classes are illustrated by definition of the variables in Tables A, B and C.

In the tables the following abbreviations are employed in addition to standard elemental symbols:

Me: methyl -Et: ethyl Pr: propyl Bu: butyl Ph: phenyl Be: benzyl Each of the exemplary compounds is prepared in the above-described manner from corresponding starting materials and either IV or VII. These starting materials are either known or are prepared by-known methods from available compounds.

Compounds I are CNS (central nervous system) active, e.g., depressants and sedatives, compounds and are useful as such. Some also are useful as anti-inflammatories. Compounds I are administered either orally or parenterally in daily doses of from 75 milligrams to 200 milligrams.

Each of the pharmaceutically active compounds of this invention, may be, e.g. incorporated, for oral administration, in a tablet as the sole active ingredient. A typical tablet is constituted by from 1 to 3 percent binder, e.g., tragacanth; from 3 to 10 percent disintegrating agent, e.g., corn starch; from 2 to 10 percent lubricant, e.g., magnesium stearate; an average dosage of active ingredient; and q.s. 100 percent of filler, e.g., lactose; all percentages being by weight. Tablets are prepared according to standard tabletting techniques, which are Well-known in the art, employing the necessary amounts of conventional granulating liquids, e.g. alcohol SD-30 and purified water. An exemplary tabletting formulation for the instant active compounds is:

Parts Title Compound of Example 1 50 Tragacanth 2 Lactose 39.5 Corn starch 5 Talcum 3 Magnesium s'tearate 0.5

Alcohol SD-30 Purified water In the examples which follow, the parts and percentages are by weight unless otherwise specified, and the temperatures are in degrees centigrade. The relationship between parts by weight and parts by volume is the same as that between the kilogram and the liter.

EXAMPLE 1 8a-phenyl-3,4,6,7,8,8a-hexahydro-ZH-pyrrolo[2,1-b] [1,3] xazin-6-0ne vacuo to obtain 18 parts of title compound, melting point (M.P.) 77 to 79, boiling point (B.P.) 127 at 0.1 mm.

Replacing the 3-benzoylpropionic acid with an equivalent amount of either S-benzoylvaleric acid or 4-butyrylbutyric acid results in obtaining the corresponding compound I.

EXAMPLE 2 Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 9.6 parts (0.05 mole) of 4-benzoylbutyric acid, 7.5 parts (0.1 mole) of 3-aminopropanol, 0.5 part of p-toluenesulfonic acid and 250 parts by volume of xylene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the solvent on a rotary evaporator. Distill the resultant oil through a Claisen head to obtain an oil, B.P. 144 at 0.1 mm., that solidifies on standing.

Dissolve the oil in hot diethyl ether. Admix the resulting solution with charcoal before removing the ether in vacuo. There are thus obtained 5.5 parts of title compound, M.P. 62.

Replacing the 4-benzoylbutyric acid with an equivalent amount of either 3-acetylpropionic acid or 4-acetylbutyric acid results in obtaining the corresponding compound I. Likewise, replacing the 3-aminopropanol with an equivalent amount of 4-aminobutanol results in obtaining the corresponding compound 1.

EXAMPLE 3 Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 10.6 parts (0.05 mole) of 4-o-chlorophenyl-4-oxobutanoic acid, 7.5 parts (0.10 mole) of S-aminopropanol, 0.5 part of p-toluenesulfonic acid and 250 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the solvent (toluene) on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Admix the resulting solution with charcoal before removing the solvent (methanol/water) in vacuo. The title compound is thus obtained.

Replacing the 4-o-chlorophenyl 4 oxobutanoic acid with an equivalent amount (10.6 parts) of 4-p-chlorophenyl-4-oxobutanoic acid, an equivalent amount (12.4 parts) of 4-(2,4-dichlorophenyl)4-oxobutanoic acid, an equivalent amount (12.4 parts) of 4-(3,4-dichlorophenyl)- 4-oxobutanoic acid, an equivalent amount (9.8 parts) of 4-ofluorophenyl-4-oxobutanoic acid, or an equivalent amount (9.8 parts) of 4p-fluorophenyl-4-oxobutanoic acid results in the preparation, in similar manner, of the corresponding compound I.

Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 15.0 parts (0.075 mole) of 4-phenyl-5-oxohexanoic acid, 8.7 parts (0.14 mole) of ethanolamine, 1 part of p-toluenesulfonic acid and 150 parts by volume of toluene. Stir and reflux the contents of the flask until Water ceases to separate in the Dean-Stark tube. Remove the solvent on a rotary evaporator. Distil the resultant oil through a Claisen head to obtain an oil that solidifies on standing.

Dissolve the oil in methylene chloride/diethylether/ pentane. Admix the resulting solution with charcoal before removing the solvent in vacuo. There are thus obtained 6.0 parts of title compound, M.P. 112 to 114.

Replacing the 4-phenyl-5-oxohexanoic acid with an equivalent amount of 2-ethyl-2-phenyl-5-oxohexanoic acid results in the preparation, in similar manner, of 6-ethyl-6- phenyl 8a-methyl-2,3,6,7,8,8a-hexahydro-5H oxazolo[3, 2-a]pyridin-5-one.

EXAMPLE 5 8-phenyl-8a-benzyl-2,3,6,7,8,8a-hexahydro-5H- oxazl0[3,2-a] pyridin-S-one Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 10.0 parts (0.035 mole) of 4,6-diphenyl--oxohexanoic acid, 4.5 parts (0.074 mole) of ethanolamine, 0.5 part of p-toluenesulfonic acid and 150 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the solvent- 22 EXAMPLE 6 8,8-diphenyl-8a-methyl-2,3,6,7,8,8a-hexahydr0- 5H-0xaz0l0[3,2-a1pyridin-5-0ne Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 20.0 parts (0.071 mole) of 4,4-diphenyl-5-oxohexanoic acid, 8.5 parts (0.14 mole) of ethanolamine, 1.0 part of p-toluenesulfonic acid and 200 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the solvent on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Admix the resulting solution with charcoal before removing the methanol/water in vacuo. There are thus obtained 3.7 parts of title compound, M.P. 188 to 190.

EXAMPLE 7 Charge a flask (equipped with a stirrer, heating mantle,

. condenser and a Dean-Stark tube) with 19.2 parts (0.1

mole) of 'y-benzoylbutyric acid, 12.0 parts (0.2 mole) of ethanolamine, 1 part of paratoluenesulfonic acid and 150 parts by volume of xylene. Stir and reflux the contents of the flask until Water ceases to separate in the Dean-Stark tube. Remove the solvent on a rotary evaporator. Distil the resultant oil through a Claisen head to obtain an oil that solidifies on standing.

Dissolve the resultant oil in ethyl acetate. Admix the resulting solution with charcoal before removing the ethyl acetate in vacuo. There are thus obtained 3.5 parts of title compound, M.P. 74 to 75.

EXAMPLE 8 10a-phenethyl-2,3,6,7,8,9,10,10a-0ctahydr0-4H- oxazino [3,2-a] wzepin-d-one QCHMH 0 Charge a flash (equipped with .a stirrer, heating mantle, condenser and a Dean-Stark tube) with 11.7 parts (0.05 mole) of 6-oxo-8-phenyloctanoic acid, 7.5 parts (0.10 mole) of 3-am-inopropanol, 0.5 part of paratoluenesulfonic acid and 250 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the toluene on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Adrnix the resulting solution with charcoal before removing the 23 methanol/water in vacuo. The title compound is thus obtained.

Replacing the 6-oXo-8-phenyloctanoic acid with an equivalent amount of 2,3,4,5-tetramethyl-6-oxoheptanoic acid or an equivalent amount of 2,3-di-(p-chlorophenyl)- 5,S-hexamethylene-6-oxoheptanoic acid results in the preparation, in similar manner, of the corresponding compound I. Replacing the 6-oxo-8-phenyloctanoic acid with an equivalent amount of 2-ethyl-2-pheny1-5-oxohexanoic acid results in the preparation, in similar manner, of 7-ethyl-7-phenyl-9a-methyl-Z,3,7,8,9,9aheXahydro-4H, 6H-pyrido[2,1-b][1,31oxazin-6-one. Likewise, replacing the 6-oXo-8-phenyl-octanoic acid with an equivalent amount of 4-ethyl-4-phenyl-5-oxohexanoic acid results in the preparation, in similar manner, of 9-ethyl-9-phenyl- 9a methyl 2,3,7,8,9,9a hexahydro 4H,6H-pyrido[2, 1-b] [1,3 oxazin-6-one.

EXAMPLE 9 8a-pal'amethoxyp/lenyl-3,4,6,7,8,8a-hexahydr0-2H- pyrrI0[2,I-b] [1,310xazin-6-0ne 1-OGH3 Charge a flash (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 10.4 parts (0.05 mole) of 4-p-methoxyphenyl-4-oxobutanoic acid, 7.5 parts (0.10 mole) of 3-aminopropanol, 0.5 part of p-toluenesulfonic acid and 250 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the solvent (toluene) on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Admix the resulting solution with charcoal before removing the solvent (methanol/water) in vacuo. The title compound is thus obtained.

Replacing the 4 -paramethoxypheny1 4 oxobutanoic acid with an equivalent amount (12.6 parts) of 4-para-nbutoxyphenyl-4-oxobutanoic acid, an equivalent amount (9.6 parts) of 4-paratolyl-4-oxobutanoic acid, or an equivalent amount (10.4 parts) of 4-(2,4-dimethylphenyl) 4 oxobutanoic acid results in the preparation, in similar maner, of the corresponding compound I.

EXAMPLE 8a-(3,4-dimethylphenyl)-3,4,6,7,8,8a-hexahydro- ZH-pyrrolo [2,1-b] [1,310xazin-6-0ne Charge a flash (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 10.4 parts (0.05 mole) of 4-(3,4-dimethylphenyl)-4-oxobutanoic acid, 7.5 parts (0.10 mole) of 3-aminopropanol, 0.5 part of p-toluenesulfonic acid and 250 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the solvent (toluene) on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Admix the resulting solution with charcoal before removing the solvent (methanol/water) in vacuo. The title compound is thus obtained.

Replacing the 4- 3 ,4-dimethylphenyl -4-oxobutanoic acid with an equivalent amount (12.3 parts) of 4-m-trifluoromethylphenyl-4-oxobutanoic acid or an equivalent amount (12.3 parts) of 4-p-trifluoromethylphenyl-4- oxobutanoic acid results in the preparation, in similar manner, of the corresponding compound 1.

EXAMPLE 11 8a-(2-chl0r0-5-trifluoromethylphenyl) -3,4,6,7,8,8ahexahydro-ZH-pyrrolo- [2,1-b] [1,3] 0xazin-6-0ne Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 14.0 parts (0.05 mole) of 4 (2-chloro-S-trifluoromethylphenyl)-4-oxobutanoic acid, 7.5 parts (0.10 mole) of 3-aminopropanol, 0.5 part of p-toluenesulfonic acid and 250 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the solvent (toluene) on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Admix the resulting solution with charcoal before removing the solvent (methanol/water) in vacuo. The title compound is thus obtained.

Replacing the 4-(2-chlor0-5-trifluoromethylphenyl)-4- oxobutanoic acid with an equivalent amount (14.1 parts) of 2-ethyl-2,4-diphenyl-4-oxobutanoic acid or an equivalent amount (15.8 parts) of 2-ethyl-2-phenyl-4chlorophenyl-4-oxobutanoic acid results in the preparation, in similar manner, of the corresponding compound I.

EXAMPLE 12 7-ethyl-7-phenyl-8a-parameth0xyplzenyl-3,4,6,7,8,8ahexahydro-ZH-pyrrolo[2,1-b] [1,3 0xazin-6-0ne OCHa Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 15.6 parts (0.05 mole) of 2 ethyl 2-phenyl-4-p-methoxyphenyl-4-oxobutanoic acid, 7.5 parts (0.10 mole) of 3-aminopropanol, 0.5 part of p-toluenesulfonic acid and 250 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the solvent (toluene) on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Admix the resulting solution with charcoal before removing the solvent (methanol/water) in vacuo. The title compound is thus obtained.

Replacing the 2-ethyl-2-phenyl-4-paramethoxyphenyl-4- oxobutanoic acid with an equivalent amount (17.5 parts) of 2 ethyl-2-phenyl-4-metatrifluoromethylphenyl-4-oxobutanoic acid or an equivalent amount (16.5 parts) of 2,2,4-triphenyl-4-oxobutanoic acid results in the preparation, in similar manner, of the corresponding compound I.

25 I EXAMPLE 13 .QAN

Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 18.2 parts (0.05 mole) of 2,2 diphenyl-4-p-chlorophenyl-4-oxobutanoic acid, 7.5 parts (0.10 mole) of 3-aminopropanol, 0.5 part of p-toluenesulfonic acid and 250 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the solvent (toluene) on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Admix the resulting solution with charcoal before removing the solvent (methanol/water) in vacuo. The title compound is thus obtained.

Replacing the 2,2-diphenyl-4-parachlorophenyl-4-oxobutanoic acid with an equivalent amount (18.0 parts) of 2,2-diphenyl-4-p-methoxyphenyl-4-oxobutanoic acid or an equivalent amount (199 parts) of 2,2-diphenyl-4-mtrifluoromethylphenyl-4-oxobutanoic acid results in the preparation, in similar manner, of the corresponding compound I.

EXAMPLE l4 CFa v A1 I Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 14.0 parts (0.05 mole) of 4 (2-chloro-5-trifluoromethylphenyl)-4-oxobutanoic acid, 6.2 parts (0.10 mole) of ethanolamine, 0.5 part of paratoluenesulfonic acid and 250 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the toluene on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Admix the resulting solution with charcoal before removing the methanol/Water in vacuo. The title compound is thus obtained.

Replacing the 4-(Z-chloro-5-trifluoromethylphenyl)-4- oxobutanoic acid with an equivalent amount (14.1 parts) of 2- ethyl-2,4-diphenyl-4-oxobutanoic acid or an equivalent amount (15.8 parts) of 2-ethyl-2-phenyl-4-parachlorophenyl-4-oxobutanoic acid results in the preparation, in similar manner, of the corresponding compound 1.

EXAMPLE Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 7.9 parts (0.05 mole) of 4-oxo-octanoic acid, 8.9 parts (0.10 mole) of 4- aminobutanol, 0.5 part of paratoluenesulfonic acid and 250 parts by volume of toluene. Stir and reflux the contents of the flask until Water ceases to separate in the Dean-Stark tube. Remove the toluene on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Admix the resulting solution with charcoal before removing the methanol/water in vacuo. The title compound is thus obtained.

Replacing the 4-oxo-octanoic acid with an equivalent amount of 2-(3,5-dimethylbenzyl)-4-ox0hexanoic acid or an equivalent amount of 3,3-tetramethy1ene-4-oxopentanoic acid results in the preparation, in similar manner, of the corresponding compound I.

EXAMPLE 16 IOa-cycl0pentyl-2,3,4,5,8,9,10,10a-0ctahydro-7H- pyrido[2,1-b] [1,3]-0xazepin-7-0ne Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 9.2. parts (0.05 mole) of 5-cyclopentyl-S-oxopentanoic acid, 8.9 parts (0.10 mole) of 4-aminobutanol, 0.5 part of paratoluenesulfonic acid and 250 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the toluene on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Admix the resulting solution with charcoal before removing the methanol/water in vacuo. The title compound is thus obtained.

Replacing the S-cyclopentyl-S-oxopentanoic acid with an equivalent amount of 3-cyclohexyl-4-ethyl-5-(3,4- methylenedioxyphenyl)-5-ox0pentanoic acid or an equivalent amount of 2,2-hexamethylene-4-cycloheptyl-S-oxohexanoic acid results in the preparation, in similar manner, of the corresponding compound I.

EXAMPLE 17 Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 10.6 parts (0.05 mole) of 6-cyclohexyl-6-oxohexanoic acid, 8.9 parts (0.10 mole) of 4-aminobutanol, 0.5 part of paratoluenesulfonic acid and 250 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the toluene on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Admix the resulting solution with charcoal before removing the methanol/water in vacuo. The title compound is thus obtained.

Replacingthe 6-cyclohexyl-6-oxohexanoic acid with an equivalent amount of 2-cyclopentyl-3-methyl-4,4-pentamethylene-6-oxoheptanoic acid or an equivalent amount of 2,2,4,8-tetraphenyl-6-oxo-octanoic acid results in the preparation, in similar manner, of the corresponding compound 1.

EXAMPLE 18 9a-cycloheptyl-2,3,5,6,7,8,9,9a-octahydro-oxaz0lo [3,2-a] azepin-S-one n9 I I Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 11.3 parts (0.05 mole) of 6-cycloheptyl-6-oxohexanoic acid, 6.1 parts (0.10 mole) of ethanolamine, 0.5 part of paratoluenesulfonic acid and 250 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the toluene on a rotary evaporator.

Dissolve the resultant oil in methanol/ water. Admix the resulting solution with charcoal before removing the methanol/water in vacuo. The title compound is thus obtained.

Replacing the 6-cycloheptyl-6-oxohexanoic acid with an equivalent amount of 2,2,5,5-tetramethyl-6-oxo-7-(3-ethyl- S-methylthiophenyl)-heptanoic acid or an equivalent amount of 3-methyl-3,5,5-triphenyl-6-oxoheptan0ic acid results in the preparation, in similar manner, of the corresponding compound I.

EXAMPLE 19 8a-(4-methoxyphenyl)-3,4,6,7,8,8a-hexalzydr0-2H- pyrrl0[2,1-b] [1,310xazin-6-one OCH;

Charge a flask (equipped with a magnetic stirring bar, condenser, thermometer and dropping funnel) with 4.0 parts (0.02 mole) of 3-(p-rnethoxybenzoyl)-propionic acid, 2.0 parts (0.02 mole) of triethylamine and 40 parts by volume of chloroform. Stir the obtained solution and cool same to 0. Add dropwise to the thus-cooled solution a solution [2.2 parts (0.02 mole) of ethyl chloroformate (ethyl chlorocarbonate) in 20 parts by volume of chloroform] at such a rate that the internal temperature of the product does not exceed 10.

Continue stirring for an additional 2.5 hours before adding dropwise to the resultant solution 3 parts by volume of B-aminopropanol.

Stir the thus-produced solution overnight (17 hours) at room temperature (20 C.). Decant the chloroform solution from the flask, and wash said solution with water, 1 N hydrochloric acid and saturated (aq.) sodium chloride solution. Dry the washed solution with sodium sulfate. Thereafter remove the solvent in vacuo on a rotary evaporator.

28 Crystallize the resultant oil frorn'methylene chloride/ diethylether to obtain 2.4 parts of N-(3-hydroxypropyl)- 3-(p-methoxybenzoyl)-propionamide, M.P. 99 to 101.

Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 5.2 parts of N- (3 hydroxypropyl) 3 (p-methoxybenzoyl)-propionamide, 0.5 part of p-toluenesulfonic acid and 200 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the solvent on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Admix the obtained solution with charcoal before removing the methanol/water in vacuo. There are thus obtained 3.9 parts of title compound, M.P. 64 to 68, B.P. 150 to 160 at 1.5 mm.

EXAMPLE 20 8a (3,4-dichlor0phenyl) -3,4,6,7,8,8a-hexahydr0-2H- pyrrolo [2,1-b] [1,3]oxazin-6-0ne Charge a flask (equipped with a magnetic stirring bar, condenser, thermometer and dropping funnel) with 19.8 parts (0.08 mole) of 3-(3,4-dichlorobenzoyl)propionic acid, 8.0 parts (0.08 mole) of triethylamine and 160 parts by volume of chloroform. Stir the obtained solution and cool same to 0. Add dropwise to the thus-cooled solution a solution [8.8 parts (0.08 mole) of ethyl chloroformate in parts by volume of chloroform] at such a rate that the internal temperature of the product does not exceed 10.

Continue stirring for an additional 2.5 hours before adding dropwise to the resultant solution 12 parts by volume (0.08 mole) of 3-aminopropanol.

Stir the thus-produced solution overnight at room temperature. Decant the chloroform solution from the flask, and wash said solution with water, 1 N hydrochloric acid and saturated (aq.) sodium chloride solution. Dry the washed solution with sodium sulfate. Thereafter remove the solvent in vacuo on a rotary evaporator.

Crystallize the resultant oil from methylene chloride/ diethylether to obtain 13.0 parts of N-(3-hydroxypropyl)- 3-(3,4-dichlorobenzoyl)-propionamide, M.P. to

-o1 o1 l J 1 o o1 o- Q NH 0 \TI 0H Dissolve the resultant oil in methylene chloride/pentane. Admix the obtained solution with charcoal before removing the methylene chloride pentane in vacuo. There are thus obtained 4.0 parts of title compound M.P. 117 to 120.

EXAMPLE 21 8a (4-flu0r0phenyl) -3,4,6,7,8,8a-hexahydrm2H-pyrrolo [2,1-b] [1,3] oxazin-6-0ne o. l U

Charge a flask (equipped with a magnetic stirring bar, condenser, thermometer and dropping funnel) with 19.6 parts (0.10 mole) of 3-(4-fluorobenzoyl) propionic acid, 10 parts (0.10 mole) of triethylamine and 200 parts by volume of chloroform. Stir the obtained solution and cool same to Add dropwise to the thus-cooled solution a solution [11.0 parts (0.10 mole) of ethyl chloroformate in 100 parts by volume of chloroform] at such a rate that the internal temperature of the product does not exceed Continue stirring for an additional 2.5 hours before adding dropwise to the resultant solution parts by volume of (0.10 mole) 3-aminopropanol.

Stir the thus-produced solution overnight at room temperature. Decant the chloroform solution from the flask, and wash said solution with Water, 1 N hydrochloric acid and saturated (aq.) sodium chloride solution. Dry the washed solution with sodium sulfate. Thereafter remove the solvent in vacuo on a rotary evaporator.

Crystallize the resultant oil from methylene chloride/ diethylether to obtain 13.2 parts of N-(3-hydroxypropyl)- 3-(4-fiuorobenzoyl)-propionamide, M.P. 87 to 89.

Charge a flask (equipped with a stirrer, heating mantle,

(3-hydroxypropyl) 3 (4-fluorobenzoyl)-propionamide,

0.5 part of para-toluenesulfonic acid and 200 parts by EXAMPLE 22 y ph nyl)-3,4,6,7,8,8a-hexahydrm2H-p r l ,1- ][1,3]oxazin-6-0ne CH O=i L Charge a flask (equipped with a magnetic stirring bar, condenser, thermometer and dropping funnel) with 15.4

30 parts (0.08 mole) of 3-(4-methylbenzoyl)-propionic acid, 8.0 parts (0.08 mole) of triethylamine and 160 parts by volume of chloroform. Stir the obtained solution and cool same at 0. Add dropwise to the thus-cooled solution a solution [8.8 parts (0.08 mole) of ethyl chloroformate in parts by volume of chloroform] at such a rate that the internal temperature of the product does not exceed 10.

Continue stirring for an additional 2.5 hours before adding dropwise to the resultant solution 12 parts by volume (0.08 mole) of 3-aminopropanol.

Stir the thus-produced solution overnight at room tem perature. Decant the chloroform solution from the flask, and wash said solution With water, 1 N hydrochloric acid and saturated (aq.) sodium chloride solution. Dry the washed solution with sodium sulfate. Thereafter remove the solvent in vacuo on a rotary evaporator.

Crystallize the result-ant oil from methylene chloride/ diethylether to obtain 13.3 parts of N-(3-hydroxypropyl)- 3(4rnethylbenzoyl)-propionamide, M.P. 101 to 102.

2k OH EXAMPLE 23 8a- (2,4-dimethylphenyl) -3,4,7,8,8a-hexahya'ro-ZH-pyrr0l0[2,1-b] [1,310xwzin-6-0ne Charge a flask (equipped with a magnetic stirring bar, condenser, thermometer and dropping funnel) with 4.1 parts (0.02 mole) of 3-(2,4-dimethylbenzoyl)-propionic acid, 2.0 parts (0.02 mole) of triethylamine and 40 parts by volume of chloroform. Stir the obtained solution and cool same to 0. Add dropwise to the thus-cooled solution a solution [2.2 parts (0.02 mole) ethyl chloroformate in 20 parts by volume of chloroform] at such a rate that the internal temperature of the product does not we ceed 10.

Continue stirring for an additional 2.5 hours before adding dropwise to the resultant solution 3.0 parts by volume (0.02 mole) of 3-aminopropanol.

Stir the thus-produced solution overnight at room temperature. Decant the chloroform solution from the flask, and Wash said solution with water, 1 N hydrochloric acid and saturated (aq.) sodium chloride solution. Dry the washed solution with sodium sulfate. Thereafter remove the solvent in vacuo on a rotary evaporator.

31 Crystallize the resultant oil from methylene chloride/ diethyl ether to obtain 2.1 parts of N-(3-hydroxypropyl)- 3-(2,4-dimethylbenzoyl)-propionamide M.P. 65 to 67.

Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 20.6 parts (0.10 mole) of 3-(2,4-dimethyl-benzoyl)propionic acid, 15.0 parts (0.20 mole) of 3-aminopropanol, 1.0 part of ptoluenesulfonic acid and 250 parts by volume of xylene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the solvent on a rotary evaporator.

Dissolve the resultant oil in methanol/water. Admix the obtained solution with charcoal before removing the methanol/water in vacuo. There are thus obtained 16.4 parts of title compound, M.P. 69 to 73, B.P. 160 at 0.25 -mm.

EXAMPLE 24 8a-(2,5-dimeflzylplzenyl)-3,4,6,7,8,8a-hexahydr0-2H- pyrrolo [2,1-b] [1,310xazin-6-0ne Charge a flask (equipped with a magnetic stirring bar, condenser, thermometer and dropping funnel) with 4.1 parts (0.02 mole) of 3-(2,5-dimethylbenzoyl)-propionic acid, 2.0 parts (0.02 mole) of triethylamine and 40 parts by volume of chloroform. Stir the obtained solution and cool same to Add dropwise to the thus-cooled solution a solution [2.2 parts (0.02 mole) of ethyl chloroformate in 20 parts by volume of chloroform] at such a rate that the internal temperature of the product does not exceed 10.

Continue stirring for an additional 2.5 hours before adding dropwise to the resultant solution 3 parts by volume of 3-aminopropanol.

Stir the thus-produced solution overnight at room temperature. Decant the chloroform solution from the flask, and wash said solution with water, 1 N hydrochloric acid and saturated (aq.) sodium chloride solution. Dry the Washed solution with sodium sulfate. Thereafter remove the solvent in vacuo on a rotary evaporator.

Crystallize the resultant oil from methylene chloride/ diethylether to obtain 2.5 parts of N-(3-hydroxypropyl)- 3-(2,5-dimethylbenzoyl)-propionamide, M.P. 65 to 67.

(3H3 i e i l/ NH 0 N I I OH on.

Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 25.7 parts of N (3-hydroxypropyl) 3 (2,5-dimethylbenzoyl) propionamide, 1.0 part of p-toluenesulfonic acid and 500 parts by volume of toluene. Stir and reflux the contents 32 of the flask until water ceases to separate in the Dean- Stark tube. Remove the solvent on a rotary evaporator. Dissolve the resultant oil in methanol/water. Admix the obtained solution with charcoal before removing the methanol/water in vacuo. There are thus obtained 13.7 parts of title compound, B.P. to at 0.2 mm.

EXAMPLE 25 Charge a flask (equipped with a magnetic stirring bar, condenser, thermometer and dropping funnel) with 21.3 parts (0.10 mole) of 3-(p-chlorobenzoyl)-propionic acid, 10 parts (0.10 mole) of triethylamine and 200 parts by volume of chloroform. Stir the obtained solution and cool same to 0. Add dropwise to the thus-cooled solution a solution [11.0 parts (0.10 mole) of ethyl chloroformate in 100 parts by volume of chloroform] at such a rate that the internal temperature of the product does not exceed 10.

Continue stirring for an additional 2.5 hours before adding dropwise to the resultant solution 15 parts by volume of 3-aminopropanol.

Stir the thus-produced solution overnight at room temperature. Decant the chloroform solution from the flask, and wash said solution with Water, 1 N hydrochloric acid and saturated (aq.) sodium chloride solution. Dry the washed solution with sodium sulfate. Thereafter remove the solvent in vacuo on a rotary evaporator.

Crystallize the resultant oil from methylene chloride/ diethylether to obtain 13.8 parts of N-(3-hydroxypropyl)- 3-(p-chlorobenzoyl)-propionamide, M.P. 85 to 87.

4L L on O Cl :1 O-

lTIH 0 N (C1103 I Charge a flask (equipped with a stirrer, heating mantle, condenser and a Dean-Stark tube) with 8.8 parts of N- (3-hydroxypropyl) 3 (p-chlorobenzoyl) propionamide, 0.5 part of p-toluenesulfonic acid and 200 parts by volume of toluene. Stir and reflux the contents of the flask until water ceases to separate in the Dean-Stark tube. Remove the solvent on a rotary evaporator.

Dissolve the resultant oil in methylene chloride/pentane. Admix the obtained solution with charcoal before removing the methylene chloride/pentane in vacuo. There are thus obtained 6.6 parts of title compound M.P. 63 to 65, B.P. to at 1.5 mm.

Various changes may be made in the structures of compound I without departing from the splrit and scope of the invention or sacrificing its material advantages. The enumerated exemplary compounds and the working examples merely provide illustrative embodiments.

33 What is claimed is: 1. A compound of the formula wherein R is a member selected from the group consisting of straight chain (lower) alkyl, aryl and ar(lower)alkyl; the aryl and the arof ar(lower)alkyl being of the formula each of R R R and R is a member selected from the group consisting of a hydrogen, straight chain (lower) alkyl, aryl and ar(lower)alkyl and, together with the member bound to the same carbon atom, polymethylene having from 4 to 6 carbon atoms; the aryl and the arof ar(lower)alkyl being of the formula I'm R13 at least one of R R R and R being hydrogen; at least one of R and R being hydrogen when R is aryl or ar(lower) alkyl; and there being at most one polymethylene group;

each of R R R R and R is a member selected from the group consisting of a hydrogen, chloro, fluoro, bromo, lower alkyl, lower alkoxy, trifluoromethyl, lower alkylthio and, together with the member on the adjacent ring carbon atom, methylenedioxy; at least one of R R R R and R being hydrogen; a plurality of trifluoromethyl groups not being bound to adjacent carbon atoms; each R and R of aryl and ar(lower)alkyl groups being hydrogen in a plurality of such groups bound to the same carbon atom; each R of aryl and ar(lower)a1kyl groups being hydrogen in a plurality of such groups bound to adjacent carbon atoms; and n represents 2 or 3.

2. A compound of claim 1 wherein R, R R R and R are as defined in claim 1 and n represents 2.

3. A compound of claim 1 wherein R, R R R and R are as defined in claim 1 and n represents 3.

4. 7a (2-chloro-5-trifluoromethylphenyl) 2,3,5,6,7,- 7a-hexahydropyrrolo [2, l-b] oxazol-S-one.

5. 8a phenyl 3,4,6,7,8,8a hexahydro 2H pyrrolo [2,1-b] [1,3 oxazin-6-one.

6. 8a -o chlorophenyl 3,4,6,7,8,8a hexahydro 2H- pyrrolo [2,l-b] [1,3 oxazin-6-one.

7. 8a p methoxyphenyl 3,4,6,7,8,8a hexahydro- 2H-pyrrolo[2,1-b] [1,3 oXazin-6-one.

8. 8a (3,4-dimethylphenyl) 3,4,6,7,8,8a hexahydro- ZH-pyrrolo [2,1-b] [1,3 oXaZin-6-one.

9. 8a (2-chloro-S-trifluoromethylphenyl) 3,4,6,7,8,- 8a-hexahydro-2H-pyrrolo [2,1-b] 1,3 oxazin-6-one.

10. 7 ethyl 7 phenyl 8a p methoxyphenyl 3,4,- 6,7,8,Sa-hexahydro-ZH-pyrrolo [2,1-b] [1,3] oxazin-6-one.

11. 7,7 diphenyl 8a p chlorophenyl 3,4,6,7,8,8ahexahydro-ZH-pyrrol-o [2,1-b] [1,3 oxazin-6-one.

12. 8a (3,4-dichlorophenyl) 3,4,6,7,8,8a hexahydro-ZH-pyrrolo [2,1-b] [1,3 oxazin-6-one.

13. 8a (4-fluorophenyl) 3,4,6,7,8,8a hexahydro- ZH-pyrrolo [2,1-b] [1,3]oxazin-6-one.

14. 8a (4-methylphenyl) 3,4,6,7,8,8a hexahydro- 2H-pyrrolo-[2,1-b] [1,3 0xazin-6-one.

15. 8a (2,4-dimethylphenyl) 3,4,7,8,8a hexahydro- ZH-pyrrolo [2,1-b] [1,3 oxazin-6-one.

16. 8a (2,5-dimethylphenyl) 3,4,6,7,8,8a hexahydro-ZH-pyrrolo [2,1-b] [1,3 oxazin-6-one.

17. 8a (4-chlorophenyl) 3,4,6,7,8a hexahydro 2H- pyrrolo [2,1-b] [1,3 oxazin-6-one.

No references cited.

WALTER A. MODANCE, Primary Examiner.

ROBERT T. BOND, Assistant Examiner. 

1. A COMPOUND OF THE FORMULA 